Reduced compressor capacity controls

Details Reduced compressor capacity controls Reduced compressor capacity controls

2006-06-07

2011-12-20

Swann, Judy (Department: 3785)

Refrigeration

Automatic control

Time or program actuator

C062S228100, C062S230000

Reexamination Certificate

active

08079227

ABSTRACT:
A method of controlling the frequency of a compressor in a chiller system is disclosed. The method includes determining a nominal minimum frequency of a compressor, and providing a control algorithm for controlling the period of time and the deviation of the actual operating frequency below the nominal minimal frequency that the compressor may operate without shutting down the chiller system. The time period of operation below nominal minimum frequency may be predetermined as a fixed time period of operation below nominal minimum frequency, or as a variable time period based on the amount by which the frequency deviates below nominal minimum frequency. Also, an absolute minimum operating frequency is provided that results in the control algorithm shutting down the chiller system and the compressor.

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